BTA: Business travel allowance. Its for business travel only and currently pegged at $5,000 per quater

PTA: Personal travel allownance, for personal travel and its pegged at $4,000 per quater

Requirements include: your valid passport, visa, valid ticket and naira at the current CBN rates. For BTA you must produce your Certificate of Incorporation and evidence you are travelling for business like a letter from the foregin company inviting you

I assume you're referring to basic travelling allowance wherby Nigerians are able to buy a specific sum of foreign currency at the official rate from a Nigerian bank. I think it's 2000 pounds or 4000 USD but not sure and this limit is per quarter i thk with evidence you are indeed travelling abroad